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- Al-Najjar, Basim, 1954-, et al.
(författare)
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Enhancing a Company’s Profitability and Competitiveness Using Integrated Vibration-Based Maintenance : A Case Study
- 2004
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Ingår i: European Journal of Operational Research. - 0377-2217 .- 1872-6860. ; 157:3, s. 643-657
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Tidskriftsartikel (refereegranskat)abstract
- In this paper a model is developed for identifying, monitoring and improving the economic impact of vibration-based maintenance (VBM). This model provides an additional possibility of identifying where, why and how much capital should be invested, and judges whether or not the investment was cost-effective. The model is further utilised to develop relevant maintenance performance measures. When the model was tested in a Swedish paper mill, the main results were: the average yearly maintenance profit achieved using integrated VBM was at least 3.58 million Swedish kronor (SEK) (approximately USD 0.358 million), and average potential savings (economic losses) were around SEK 30 million (USD 3 million). Furthermore, the model facilitated identification of problem areas and recognition of where investments should be made. The major conclusion is that the better the data coverage and quality, the greater control is possible over direct maintenance costs, savings and further profits in maintenance. Moreover, using the model it would be easier and more reliable to detect deviations in the maintenance performance and eliminate their causes at an early stage.
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- Al-Najjar, Basim, 1954-, et al.
(författare)
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Improving Effectiveness of Manufacturing Systems using Total Quality Maintenance
- 2000
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Ingår i: Integrated Manufacturing Systems. - : Emerald. - 0957-6061 .- 1758-583X. ; 11:4, s. 267-276
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Tidskriftsartikel (refereegranskat)abstract
- In manufacturing systems intelligent techniques are being used to integrate and interpret data from multiple sensors to predict tool wear and tool life. Less attention is devoted to developments of integrated condition monitoring systems, which enable the user to evaluate a multi-variant system based on the data collected from, e.g. maintenance, quality, production, etc.In this paper we discussed different approaches of how to keep availability, quality, and productivity at high levels. Also, we proposed a new approach for expert system concept, which is characterised by using total quality maintenance (TQMain.) concept; having a common database, and continuously improved knowledge base with intelligent inference engine. It can enhance data reliability, decision making certainty, remove the redundancy in monitoring systems, and allow the user to detect and eliminate reasons behind variations through effective diagnosis and prognosis. This will enhance the performance-efficiency, availability and quality rate, i.e. overall equipment effectiveness of the manufacturing systems.
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- Al-Najjar, Basim, 1954-, et al.
(författare)
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Selecting the Most Efficient Maintenance Approach Using Fuzzy Multiple Criteria Decision Making
- 2003
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Ingår i: International Journal of Production Economics. - 0925-5273 .- 1873-7579. ; 84:1, s. 85-100
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Tidskriftsartikel (refereegranskat)abstract
- We assess the most popular maintenance approaches, i.e. strategies, policies, or philosophies, using a fuzzy multiple criteria decision making (MCDM) evaluation methodology. We illustrate with two examples how the suggested evaluation methodology identifies the most informative approach. Using the fuzzy MCDM, it would be possible to select in advance, the most informative (efficient) maintenance approach. Consequently, this leads to less planned replacements, and failures would be reduced to approximately zero and higher utilization of component life can be achieved. Thus, the maintenance department could contribute more to the business objectives throughout participating effectively in adding value to the production activities.
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